content: /**
   * Copyright (c) 2016-present, RxJava Contributors.
   *
   * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in
   * compliance with the License. You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software distributed under the License is
   * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See
   * the License for the specific language governing permissions and limitations under the License.
   */
  
  package io.reactivex.observable.internal.operators;
  
  import java.util.concurrent.TimeUnit;
  import java.util.concurrent.atomic.AtomicInteger;
  
  import io.reactivex.common.*;
  import io.reactivex.common.internal.disposables.DisposableHelper;
  import io.reactivex.observable.*;
  import io.reactivex.observable.internal.queues.SpscLinkedArrayQueue;
  
  public final class ObservableSkipLastTimed<T> extends AbstractObservableWithUpstream<T, T> {
      final long time;
      final TimeUnit unit;
      final Scheduler scheduler;
      final int bufferSize;
      final boolean delayError;
  
      public ObservableSkipLastTimed(ObservableSource<T> source,
              long time, TimeUnit unit, Scheduler scheduler, int bufferSize, boolean delayError) {
          super(source);
          this.time = time;
          this.unit = unit;
          this.scheduler = scheduler;
          this.bufferSize = bufferSize;
          this.delayError = delayError;
      }
  
      @Override
      public void subscribeActual(Observer<? super T> t) {
          source.subscribe(new SkipLastTimedObserver<T>(t, time, unit, scheduler, bufferSize, delayError));
      }
  
      static final class SkipLastTimedObserver<T> extends AtomicInteger implements Observer<T>, Disposable {
  
          private static final long serialVersionUID = -5677354903406201275L;
          final Observer<? super T> actual;
          final long time;
          final TimeUnit unit;
          final Scheduler scheduler;
          final SpscLinkedArrayQueue<Object> queue;
          final boolean delayError;
  
          Disposable s;
  
          volatile boolean cancelled;
  
          volatile boolean done;
          Throwable error;
  
          SkipLastTimedObserver(Observer<? super T> actual, long time, TimeUnit unit, Scheduler scheduler, int bufferSize, boolean delayError) {
              this.actual = actual;
              this.time = time;
              this.unit = unit;
              this.scheduler = scheduler;
              this.queue = new SpscLinkedArrayQueue<Object>(bufferSize);
              this.delayError = delayError;
          }
  
          @Override
          public void onSubscribe(Disposable s) {
              if (DisposableHelper.validate(this.s, s)) {
                  this.s = s;
                  actual.onSubscribe(this);
              }
          }
  
          @Override
          public void onNext(T t) {
              final SpscLinkedArrayQueue<Object> q = queue;
  
              long now = scheduler.now(unit);
  
              q.offer(now, t);
  
              drain();
          }
  
          @Override
          public void onError(Throwable t) {
              error = t;
              done = true;
              drain();
          }
  
          @Override
          public void onComplete() {
              done = true;
              drain();
          }
  
          @Override
          public void dispose() {
              if (!cancelled) {
                  cancelled = true;
                  s.dispose();
  
                  if (getAndIncrement() == 0) {
                      queue.clear();
                  }
              }
          }
  
          @Override
          public boolean isDisposed() {
              return cancelled;
          }
  
          void drain() {
              if (getAndIncrement() != 0) {
                  return;
              }
  
              int missed = 1;
  
              final Observer<? super T> a = actual;
              final SpscLinkedArrayQueue<Object> q = queue;
              final boolean delayError = this.delayError;
              final TimeUnit unit = this.unit;
              final Scheduler scheduler = this.scheduler;
              final long time = this.time;
  
              for (;;) {
  
                  for (;;) {
                      if (cancelled) {
                          queue.clear();
                          return;
                      }
  
                      boolean d = done;
  
                      Long ts = (Long)q.peek();
  
                      boolean empty = ts == null;
  
                      long now = scheduler.now(unit);
  
                      if (!empty && ts > now - time) {
                          empty = true;
                      }
  
                      if (d) {
                          if (delayError) {
                              if (empty) {
                                  Throwable e = error;
                                  if (e != null) {
                                      a.onError(e);
                                  } else {
                                      a.onComplete();
                                  }
                                  return;
                              }
                          } else {
                              Throwable e = error;
                              if (e != null) {
                                  queue.clear();
                                  a.onError(e);
                                  return;
                              } else
                              if (empty) {
                                  a.onComplete();
                                  return;
                              }
                          }
                      }
  
                      if (empty) {
                          break;
                      }
  
                      q.poll();
                      @SuppressWarnings("unchecked")
                      T v = (T)q.poll();
  
                      a.onNext(v);
                  }
  
                  missed = addAndGet(-missed);
                  if (missed == 0) {
                      break;
                  }
              }
          }
      }
  }
  